Outlook 2007: Can't shut down auto-archive?

G'day there,

I am using Outlook 2007 on an XP machine. Specs below.

I use my 2007 Outlook Calendar for recording everything and it also ties in with my business tax returns; consequently I don't want to archive any of the calendar items (for 5-years to keep tax man happy)

It does not matter what I options I choose in Autoarchive, they are ignored and Outlook is running Autoarchive daily on my calendar.
Tools; Options; Other; Autoarchive

If I use Folder List; Right Click; Properties; Autoarchive these options are also ignored.

I have been doing battle with this for months now and am much greyer as a result!

Please help:
*What's broken?
*How can I stop Autoarchive?
*Is there a way to reset the options; e.g. could I delete OST/PST file to reset options?

Everything is up to date.

The size of the PST/OST file is not an issue because I don't use Outlook 2007 to store my emails...